Versions of HTML:
  • HTML 1.0 and 2.0
  • HTML 3.0
  • HTML 4.0
  • HTML 4.01
  • XHTML 1.0
  • HTML 5.0
html 4.01
always start each page with a DOCTYPE
<html> starts and </html> ends page
everything must go in the <head></head> or <body></body>
<head>always use a <title>, <meta> and <style> are opitional
<body> <h?>,<p>, <blockquote> allowed
with the different types of code.....YOU have to tell the BROWSER what to do OTHERWISE it uses default code
XHTML is aimed to replace HTML



  • Element- delimited by angle brackets, identify the nature of the content they surround, general format: <element>… </element>. And an empty element is <empty-Element/>
  • Attribute- name-value pairs that occur inside start-tags after element name like <element attribute=”value”>
  • DTD
  • Well-formed
  • Validation
  • SGML
  • Strict
  • XHTML
  • Transitional
  • W3C
  • CSS
  • Frameset
  • XML- means extensible markup language not fixed format like html. XML is a meta-language- a language for describing other languages. enable you to define your own customized markup languages for different classes of documents. XML is considered the “key” to e-business. XML enables business application sharing, direct transactions and other business applications. Blending EDI(electronic data exchange) with HTML for business.

Validation is done at http://validator.w3.org/. Validation and standardization is important because a wide variety of web browsers are available to different users, and ensuring that your web content is available to all of those users is important.